How it works: every question gives you examples containing a hidden rule. Infer the simplest rule that explains the complete pattern, then apply it to the new case.
Difficulty: Easy questions usually use one feature or condition, Medium questions add category and comparison rules, and Hard questions use multi-feature transformations or relationships. Mixed mode balances all three levels across the test.
Timing: choose 30, 45, or 60 seconds per question, or use Untimed mode. Leaving the tab pauses active timing until you return.
Controls: press 1–4 to choose an answer. When explanations are on, press Enter or N to continue after feedback. Press Esc to end the current test; aborted sessions are not saved.